Light bulb



FIG. 1 is a line drawing of a perspective view of the light bulb;

FIG. 2 is a line drawing of a side view of the light bulb in which all the sides of the light bulb are identical;

FIG. 3 is an image showing a top view of the light bulb;

FIG. 4 is a line drawing of a top view of the light bulb; and,

FIG. 5 is a line drawing of a bottom view of the light bulb.

The broken lines are for illustration only and form no part of the claimed design. The screw-in connector shown in the figures is not part of the claimed design. 

CLAIM The ornamental design for a light bulb, as shown and described. 